safety regulations for dishes in a hotel or restaurant 2017 What is Acid Mine Drainage?
Acid water flow in coal or metal mines is called acid mine drainage. This phenomenon is also called acid rock drainage. There is no need for this to occur only in mining areas. The Transportation Corridor and construction site are also the location of the transportation corridor and construction site. This phenomenon occurs naturally in some places. Rock is the cause of this problem. The process of the childSurface mining needs to be dug in deep places. This mining process is usually lower than the depth of the water level. In order to prevent flooding, it needs to remove water constantly. Once a mining activity at a particular location is abandoned and the water is not discharged on a regular basis; Metal sulfide exposed to water and air in the mine leads to the formation of acidic pools. Mine drainage conditions affect the chemical elements in the soil to a large extent through changes in pH and temperature levels. The pH value is not only zero, but sometimes negative. It can reach a temperature of up to 47 °c. Evaporation of water from an acidic pool creates a negative pH value, making the wastewater more acidic by increasing the concentration of hydrogen ions. Soil with high acidic content is not good for plant growth. Mine Drainage that forms a stream also adversely affects aquatic plants and animals, and even eliminates all fish in the water body to a certain extent. If this discharge is released into streams and rivers where bridges have been built, the corrosiveness of acid water can even cause structural damage. This phenomenon also prevents water from being used for drinking. Treatment usually involves the neutralization of the acidic content of the drain by introducing reagents that lead to the precipitation of metal sulfur. --xa0In view of the problem of acid drainage in mines, effective treatment measures are put forward. : It is the most commonly used treatment method for mine drainage. In this treatment, lime slurry is added to the tank containing mine drainage. Through this treatment, the pH value is increased to 9. In addition to lime slurry, there are also recycled sludge in the tank. Sludge helps precipitate toxic metals that do not dissolve when pH is 9. The mud obtained from this treatment is sent to the sludge settling container. Metal-When clean water stays on top and is removed, settle down from this mud, heavier and settle down. The deposited metal can be recycled and reused. Free sulfur such as NaHS and hydrogen sulfide. Used to precipitate base metals in acidic solutions. After this reaction, the solution will be treated for the separation of solids and liquids. The wastewater obtained after separation of the solid and liquid is treated to reduce sulfuric acid. Biosulfur is also used as an alternative to precipitation of metals. : This process is done by adding limestone debris to the site of acid mine drainage. Lime materials other than limestone are also used for neutrals. Therefore, we can conclude that acidic mine drainage has a harmful effect on the environment and that these acidic streams should be treated with the technology given earlier. * PH is a measure of the acidity and alkalinity of aqueous solution. A solution with a pH value less than 7 is acidic in nature, and a solution with a pH value greater than 7 is alkaline in nature. The pH value of pure water is close to 7, and the pH value of concentrated acid such as hydrochloric acid (HCl) is close to 2.